M2 - Confirm Auth

Hi,

I am using Sandbox for M2 - confirm auth for mobile OTP confirmation. I have used end point as below
https://dev.abdm.gov.in/gateway/v0.5/users/auth/confirm
For this end point, I was not getting webhook request. I have changed the end point url to https://dev.abdm.gov.in/gateway/v0.5/users/auth/init
as suggested on earlier topic posted here

I am using blow payload for OTP confirmation . I am getting web-hook request however i am getting results as
“requestId”: “ef8d2cd0-f94d-4c51-811f-954b136133e1”,
“error”: {
“code”: 2500,
"message": "query is marked non-null but is null"
},

{

"requestId": "{{$guid}}",

"timestamp": "{{$isoTimestamp}}",

"transactionId": "e884af8b-89bd-4d16-9360-fc23f7d5f14f",

"credential": {

“authCode”: “624309”

    }

}

Can you please suggest appropriate solution for this issue ?

Thanks,
Karthik